I have a user level in a site. It allows people to post to two Custom Post Types (say Type A and Type B). I need to allow users to be able to Publish to Post Type A but only save drafts to Post Type B.

functions.php

<?php

add_action( 'save_post', function( $post_id ) {

    if ( !wp_is_post_revision( $post_id ) ) {
        $post_type = get_post_type( $post_id );

        // apply on specific post type and for specific user role
        if ( $post_type == 'product' && current_user_can( 'subscriber' ) ) {
            wp_update_post( array(
                'ID' => $post_id,
                'post_status' => 'draft'
            ) );
        }
    }
} );